Expt: Determining Relative Density of a Liquid using Hydrometer
Aim: To determine the relative density of a liquid with respect to the density of water using a hydrometer.
Hydrometer: A hydrometer is an instrument used to measure relative density of two liquids. It works on the principle of flotation, such that the weight of the liquid displaced by the hydrometer is equal to its weight. The height at which the hydrometer floats in a liquid is inversely proportional to the density of that liquid.
Liquids with different densities, for example - water, brine, diesel, CCl4 etc.
Relative Density of Liquid = Density of Liquid/Density of Water
(also) Relative Density of Liquid = Float Height of Hydrometer in Water/Float Height of Hydrometer in Liquid